Sprinkle yeast into 1/2 cup warm water.,Stir until dissolved. Add warm milk, sugar, salt, margarine and 2 cups flour.,Beat until smooth (about 1 minute).,Add 1 more cup of flour.,Beat vigorously at medium speed for 2 to 3 minutes.,______,Knead 5 to 10 minutes, until smooth and elastic.,Let rise double in size.,Form into 2 loaves.,Let rise double again.,Bake at 400° until brown.